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Category:   Application (Generic)  >   UnZip Vendors:   Info-ZIP
(Red Hat Issues Fix) UnZip NEEDBITS Macro Memory Free May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019638
SecurityTracker URL:  http://securitytracker.com/id/1019638
CVE Reference:   CVE-2008-0888   (Links to External Site)
Date:  Mar 18 2008
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in UnZip. A remote user may be able to cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted file that, when unzipped by the target user or application, will cause uninitialized memory or previously freed memory to be freed. This can cause the target application to crash or potentially execute arbitrary code.

The vulnerability resides in the NEEDBITS macro in the inflate_dynamic() function in 'inflate.c'.

Tavis Ormandy reported this vulnerability.
Impact:   A remote user can create a file that, when unzipped by the target user or application, will execute arbitrary code on the target system or cause the application to crash.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0196.html
Vendor URL:  www.info-zip.org/UnZip.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 18 2008 UnZip NEEDBITS Macro Memory Free May Let Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Tue, 18 Mar 2008 15:42:47 -0400
Subject:  [RHSA-2008:0196-01] Moderate: unzip security update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: unzip security update
Advisory ID:       RHSA-2008:0196-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0196.html
Issue date:        2008-03-18
CVE Names:         CVE-2008-0888 
=====================================================================

1. Summary:

Updated unzip packages that fix a security issue are now available.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1  - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

The unzip utility is used to list, test, or extract files from a zip
archive.

An invalid pointer flaw was found in unzip. If a user ran unzip on a
specially crafted file, an attacker could execute arbitrary code with that
user's privileges. (CVE-2008-0888)

Red Hat would like to thank Tavis Ormandy of the Google Security Team for
reporting this issue.

All unzip users are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  

This update is available via Red Hat Network.  Details on how to use 
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

431438 - CVE-2008-0888 unzip: free() called for uninitialized or already freed pointer

6. Package List:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 :

Source:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/unzip-5.50-31.EL2.1.src.rpm

i386:
unzip-5.50-31.EL2.1.i386.rpm

ia64:
unzip-5.50-31.EL2.1.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/unzip-5.50-31.EL2.1.src.rpm

ia64:
unzip-5.50-31.EL2.1.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/unzip-5.50-31.EL2.1.src.rpm

i386:
unzip-5.50-31.EL2.1.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/unzip-5.50-31.EL2.1.src.rpm

i386:
unzip-5.50-31.EL2.1.i386.rpm

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/unzip-5.50-36.EL3.src.rpm

i386:
unzip-5.50-36.EL3.i386.rpm
unzip-debuginfo-5.50-36.EL3.i386.rpm

ia64:
unzip-5.50-36.EL3.ia64.rpm
unzip-debuginfo-5.50-36.EL3.ia64.rpm

ppc:
unzip-5.50-36.EL3.ppc.rpm
unzip-debuginfo-5.50-36.EL3.ppc.rpm

s390:
unzip-5.50-36.EL3.s390.rpm
unzip-debuginfo-5.50-36.EL3.s390.rpm

s390x:
unzip-5.50-36.EL3.s390x.rpm
unzip-debuginfo-5.50-36.EL3.s390x.rpm

x86_64:
unzip-5.50-36.EL3.x86_64.rpm
unzip-debuginfo-5.50-36.EL3.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/unzip-5.50-36.EL3.src.rpm

i386:
unzip-5.50-36.EL3.i386.rpm
unzip-debuginfo-5.50-36.EL3.i386.rpm

x86_64:
unzip-5.50-36.EL3.x86_64.rpm
unzip-debuginfo-5.50-36.EL3.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/unzip-5.50-36.EL3.src.rpm

i386:
unzip-5.50-36.EL3.i386.rpm
unzip-debuginfo-5.50-36.EL3.i386.rpm

ia64:
unzip-5.50-36.EL3.ia64.rpm
unzip-debuginfo-5.50-36.EL3.ia64.rpm

x86_64:
unzip-5.50-36.EL3.x86_64.rpm
unzip-debuginfo-5.50-36.EL3.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/unzip-5.50-36.EL3.src.rpm

i386:
unzip-5.50-36.EL3.i386.rpm
unzip-debuginfo-5.50-36.EL3.i386.rpm

ia64:
unzip-5.50-36.EL3.ia64.rpm
unzip-debuginfo-5.50-36.EL3.ia64.rpm

x86_64:
unzip-5.50-36.EL3.x86_64.rpm
unzip-debuginfo-5.50-36.EL3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0888
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2008 Red Hat, Inc.
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